10 years ago you could have a thread without /pol/ buzzwords coming up. 10 years ago the snarl word of the day was "hipster" for god's sake, you can look back through the archives and see the decline.
I haven't been a 4chan user for a long time (pre-Sarkeesian era), so my comment shouldn't be interpreted as an expert opinion on the decline of 4chan.
That said, doxxing and raiding someone in this way just because they're unpopular wouldn't have been out of the ordinary in 2010.
The Chris Chan saga also started in 2007, from what I just looked up.
There was definitely a gradual decline, but it was happening even back in the 00s.
And the author of the temporary-audacity fork has refused to actually evidence the "spam mails" or phone calls, probably because you cannot find either of his addresses online using his username and thus it makes no sense for them to be spammed. What happened here is that they had a poll, /g/ turned up, suggested a name and got it voted in. He said no because democracy only matters when the guy in charge gets what he wants, and now he's crying like a bitch and trying to rally equally bitchy people to his side. Simple. He even posted the threads that debunk himself but I'm also sure he deleted the tweets with them so he couldn't burn himself any more.
The reality of the situation is that the repo creator can't handle internet banter slighty hotter than Facebook for the elderly, got mad, fed the trolls and made things up.